<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>Astronaut 404</title>
		<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.3/css/bootstrap.min.css">
		<style>@import url("https://fonts.googleapis.com/css?family=Nunito+Sans");
:root {
  --blue: #0e0620;
  --white: #fff;
  --green: #2ccf6d;
}

html,
body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: "Nunito Sans";
  color: var(--blue);
  font-size: 1em;
}

button {
  font-family: "Nunito Sans";
}

ul {
  list-style-type: none;
  -webkit-padding-start: 35px;
          padding-inline-start: 35px;
}

svg {
  width: 100%;
  visibility: hidden;
}

h1 {
  font-size: 7.5em;
  margin: 15px 0px;
  font-weight: bold;
}

h2 {
  font-weight: bold;
}

.hamburger-menu {
  position: absolute;
  top: 0;
  left: 0;
  padding: 35px;
  z-index: 2;
}
.hamburger-menu button {
  position: relative;
  width: 30px;
  height: 22px;
  border: none;
  background: none;
  padding: 0;
  cursor: pointer;
}
.hamburger-menu button span {
  position: absolute;
  height: 3px;
  background: #000;
  width: 100%;
  left: 0px;
  top: 0px;
  transition: 0.1s ease-in;
}
.hamburger-menu button span:nth-child(2) {
  top: 9px;
}
.hamburger-menu button span:nth-child(3) {
  top: 18px;
}
.hamburger-menu [data-state=open] span:first-child {
  transform: rotate(45deg);
  top: 10px;
}
.hamburger-menu [data-state=open] span:nth-child(2) {
  width: 0%;
  opacity: 0;
}
.hamburger-menu [data-state=open] span:nth-child(3) {
  transform: rotate(-45deg);
  top: 10px;
}

nav {
  position: absolute;
  height: 100%;
  top: 0;
  left: 0;
  background: var(--green);
  color: var(--blue);
  width: 300px;
  z-index: 1;
  padding-top: 80px;
  transform: translateX(-100%);
  transition: 0.24s cubic-bezier(0.52, 0.01, 0.8, 1);
}
nav li {
  transform: translateX(-5px);
  transition: 0.16s cubic-bezier(0.44, 0.09, 0.46, 0.84);
  opacity: 0;
}
nav a {
  display: block;
  font-size: 1.75em;
  font-weight: bold;
  text-decoration: none;
  color: inherit;
  transition: 0.24s ease-in-out;
}
nav a:hover {
  text-decoration: none;
  color: var(--white);
}
nav[data-state=open] {
  transform: translateX(0%);
}
nav[data-state=open] ul li:nth-child(1) {
  transition-delay: 0.16s;
  transform: translateX(0px);
  opacity: 1;
}
nav[data-state=open] ul li:nth-child(2) {
  transition-delay: 0.32s;
  transform: translateX(0px);
  opacity: 1;
}
nav[data-state=open] ul li:nth-child(3) {
  transition-delay: 0.48s;
  transform: translateX(0px);
  opacity: 1;
}
nav[data-state=open] ul li:nth-child(4) {
  transition-delay: 0.64s;
  transform: translateX(0px);
  opacity: 1;
}

.btn {
  z-index: 1;
  overflow: hidden;
  background: transparent;
  position: relative;
  padding: 8px 50px;
  border-radius: 30px;
  cursor: pointer;
  font-size: 1em;
  letter-spacing: 2px;
  transition: 0.2s ease;
  font-weight: bold;
  margin: 5px 0px;
}
.btn.green {
  border: 4px solid var(--green);
  color: var(--blue);
}
.btn.green:before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 0%;
  height: 100%;
  background: var(--green);
  z-index: -1;
  transition: 0.2s ease;
}
.btn.green:hover {
  color: var(--white);
  background: var(--green);
  transition: 0.2s ease;
}
.btn.green:hover:before {
  width: 100%;
}

@media screen and (max-width: 768px) {
  body {
    display: block;
  }

  .container {
    margin-top: 70px;
    margin-bottom: 70px;
  }
}</style>
	</head>
	<body>
		<div class="hamburger-menu">
		  <button class="burger" data-state="closed">
		    <span></span>
		    <span></span>
		    <span></span>
		  </button>
		</div>
		<nav data-state="closed">
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		<main>
		  <div class="container">
		    <div class="row">
		      <div class="col-md-6 align-self-center">
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		      <div class="col-md-6 align-self-center">
		        <h1>404</h1>
		        <h2>UH OH! You're lost.</h2>
		        <p>The page you are looking for does not exist.
		          How you got here is a mystery. But you can click the button below
		          to go back to the homepage.
		        </p>
		        <button class="btn green">HOME</button>
		      </div>
		    </div>
		  </div>
		</main>
		<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.1.1/gsap.min.js"></script>
		<script>gsap.set("svg", { visibility: "visible" });
gsap.to("#headStripe", {
  y: 0.5,
  rotation: 1,
  yoyo: true,
  repeat: -1,
  ease: "sine.inOut",
  duration: 1 });

gsap.to("#spaceman", {
  y: 0.5,
  rotation: 1,
  yoyo: true,
  repeat: -1,
  ease: "sine.inOut",
  duration: 1 });

gsap.to("#craterSmall", {
  x: -3,
  yoyo: true,
  repeat: -1,
  duration: 1,
  ease: "sine.inOut" });

gsap.to("#craterBig", {
  x: 3,
  yoyo: true,
  repeat: -1,
  duration: 1,
  ease: "sine.inOut" });

gsap.to("#planet", {
  rotation: -2,
  yoyo: true,
  repeat: -1,
  duration: 1,
  ease: "sine.inOut",
  transformOrigin: "50% 50%" });


gsap.to("#starsBig g", {
  rotation: "random(-30,30)",
  transformOrigin: "50% 50%",
  yoyo: true,
  repeat: -1,
  ease: "sine.inOut" });

gsap.fromTo(
"#starsSmall g",
{ scale: 0, transformOrigin: "50% 50%" },
{ scale: 1, transformOrigin: "50% 50%", yoyo: true, repeat: -1, stagger: 0.1 });

gsap.to("#circlesSmall circle", {
  y: -4,
  yoyo: true,
  duration: 1,
  ease: "sine.inOut",
  repeat: -1 });

gsap.to("#circlesBig circle", {
  y: -2,
  yoyo: true,
  duration: 1,
  ease: "sine.inOut",
  repeat: -1 });


gsap.set("#glassShine", { x: -68 });

gsap.to("#glassShine", {
  x: 80,
  duration: 2,
  rotation: -30,
  ease: "expo.inOut",
  transformOrigin: "50% 50%",
  repeat: -1,
  repeatDelay: 8,
  delay: 2 });


const burger = document.querySelector('.burger');
const nav = document.querySelector('nav');

burger.addEventListener('click', e => {
  burger.dataset.state === 'closed' ? burger.dataset.state = "open" : burger.dataset.state = "closed";
  nav.dataset.state === "closed" ? nav.dataset.state = "open" : nav.dataset.state = "closed";
});</script>
	</body>
</html>
